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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
PROPERTY AND EQUIPMENT, accumulated depreciation $ 951.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 930.5us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 1,500,000,000us-gaap_CommonStockSharesAuthorized 1,500,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 163,562,149us-gaap_CommonStockSharesIssued 163,562,149us-gaap_CommonStockSharesIssued
Treasury stock, shares 49,645,702us-gaap_TreasuryStockShares 50,248,909us-gaap_TreasuryStockShares